I went to Milan recently via Bergamo Airport, so I thought I'd pass on what I know.
It cost 7 Euros to get a bus from the airport to the train station in the city centre, same price to get back to the airport. It takes just under an hour, and is 48km to Milan (according to the road sign I saw as we left the airport). You can buy your ticket outside the bus and the stops are just outside the airport, but you can also book in advance and that might be an idea seeing as there will be plenty of blues arriving at the same time. We used a firm called Terravision and it was a doddle - booked online from the airport, paid at the bus on the way back.
When you get to Milan there is a travel ticket you can buy for 7 euros which gets you on all the buses and the metro. The same ticket is 12 euros for 3 days, so definitely get that if you're staying for more than a day.
The metro system is basically like the London underground. The lines are all colour coded - they may have names but you don't have to know the names. To get to the San Siro you need to get on the purple line, which takes you right to the ground. Trams run late enough for you to get back to the city centre after the match.
It was on average 6-7 euros a pint, and you can get a decent pizza for 7-10 euros. The ice cream is also worth a try if you can be arsed.
We went for a few beers in the Navigli area of Milan. You can get the tram there, and there are plenty of decent bars there.
Also, I tried to speak Italian (well, I said grazie, ciao and buon giorno a lot) but was surprised how many people spoke English.